1 Status of receivers related activities Damien Prieur University of Pittsburgh 12/01/2010L1Calo...
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Transcript of 1 Status of receivers related activities Damien Prieur University of Pittsburgh 12/01/2010L1Calo...
1
Status of Status of receivers related activitiesreceivers related activities
Damien PrieurDamien PrieurUniversity of Pittsburgh
12/01/2010 L1Calo Joint Meeting - Heidelberg
12/01/2010 L1Calo Joint Meeting - Heidelberg2
Receivers SoftwareReceivers Software
Overhaul of L1GainDb & UsbController packages Improved USB communication Database access implemented
Larg_L1MON_A & Larg_L1MON_C segments enabled Right on time before beam ! Thanks to Murrough L., Fatih B. & Henric W. Have to be moved out of the LArg segment (Tile/L1Calo calibration runs)
12/01/2010 L1Calo Joint Meeting - Heidelberg3
Rx Gains - Online Software
Receivers Strategy Defines the set of receiver gains to be loaded Selection through dropdown list in L1Calo panel Must be set before CONFIG step !
Controller communication issues Few USB communication errors observed ~1% Not critical, have to re-config the concerned
segment
12/01/2010 L1Calo Joint Meeting - Heidelberg4
Rx Gains – Database Structure
Oracle INTR server Store conditions before start of run Strategy, final gains, DACs & status
Factor folders 8192 channels/factors per folder
Define Strategies One strategy = set of factor folders Selected on L1Calo panel Gains from different folders are factorized (per channel)
12/01/2010 L1Calo Joint Meeting - Heidelberg5
EETT Calibration Calibration
12/01/2010 L1Calo Joint Meeting - Heidelberg6
ET Calibration
LArg/L1Calo energy scans Match L1Calo to LArg offline energy
Use calibration OFCs Corrections for high voltage, dead channels Correction for disabled FEBs, dead OTX
HAD
Gains produced in time for beam Thanks to Veit Scharf & Antoine Marzin EMB, EMEC, HEC, Tile
EM
1.3
1
0.7
1.5
1
0.4
12/01/2010 L1Calo Joint Meeting - Heidelberg7
No calibration for FCAL yet Technical issues to reconstruct LArg energy
Problematic towers Few towers with non-optimal calibration Sick TBB
EMB/EMEC overlap region All trigger cable installed Have to determine correct length
ET Calibration
HAD
EM
12/01/2010 L1Calo Joint Meeting - Heidelberg8
Splashes
Correlation plot from Huaqiao Zhang
3% bias for EMB and EMEC To be investigated
TBB delays not appropriate Set to calibration instead of physics Few % deviation
12/01/2010 L1Calo Joint Meeting - Heidelberg9
B/EC Overlap RegionB/EC Overlap Region
12/01/2010 L1Calo Joint Meeting - Heidelberg10
Overlap cabling
Barrel Receiver
EMEC Receiver
EM
B
Ove
rlap
‘octopus’ cable37-pin to 4 x 9-pin connectors
EMEC Overlap
VGA
VGA
+
‘E’ connector
EMB & EMEC overlap channels summed at the receivers level
12/01/2010 L1Calo Joint Meeting - Heidelberg11
‘E’ connectors
EM
B
Cra
teEM
EC
Cra
te
Breakout boxBill ClelandPittsburgh
4 x 4-pair cables
1 x 16-pair cable
Overlap cabling
All cables installed Cables prod. &
inst.Michel MathieuAndrei Akimov
EMB EMEC
0 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
0
1
2
3
4
5
6
7
pa
irA-Side
12/01/201012
L1Calo Joint Meeting - Heidelberg
Overlap timing from beam-splash events
Octopus cables 5S & 1S were in place
Set receiver gains to alternate the EMB/EMEC signal components vs phi
connector
2 0
A-SideC-Side
EMEC
EMBEMEC
EMB
phi
13
TT to TT timing raisonnable for EMB
Unexpected offset between EMB & EMEC…
50 ns 63 ns
Overlap timing from beam-splash events
Cables longer than nominal values
To be on the safe side ~10-15 ns
Non nominal TBB delays ~3-6 ns
Bug in length calculations ~20 ns
Still 15-20 ns to be understood PS rise time ≠ energy fraction
[bc] [bc]
EMECEMB
EMECEMB
12/01/2010 L1Calo Joint Meeting - Heidelberg
12/01/2010 L1Calo Joint Meeting - Heidelberg14
Calibration delays set until first collisions Determined from single-layer phos4 runs
Then moved to physics delays Based on calibration delays + LAr tool to get physics/calib. time difference
Tower Builder Boards delays
Back layer is the culprit
Most probably bug in calibration cable length used to compute phys/calib difference
eta=0.15 (0x00140500): 6 7 7 6 eta=0.05 (0x00100c01): 0 0 0 7
Ps Fr Md Bk
Central towers not timed
Caused by physics delays
12/01/2010 L1Calo Joint Meeting - Heidelberg15
TBB delays database, Paolo working on
it
Understand physics delays at eta=0
Barrel/End Cap overlap region Have to accumulate data to check/compute timing Understand discrepancies wrt computed values
Ongoing work